Scale



July 14,1931.

G. WALKER S GALE Filed March 21, 1929 2 Sheets-Sheet l INVENTOR. W W M ATTORNEYS.

July 14, 1931.

G WALKER SCALE Filed March 21, 1929 2 Sheets-Sheet 2 INVENTOR. LMMH MIam 4 W.

A TTORNEYS.

Patented July 14, 1931 UNITED STATES FATENT FFRZE GEORGE WALKER, 0FBROOKLYN, NEVT YORK, ASSIGNOR TO THE JACOBS BROS. CO. INC., OF BROOKLYN,NEW YORK, A CORPORATION OF NEV YORK SCALE Application filed March 21,

will be relatively few in number and individually simple and rugged inconstruction, these parts being capable of being assembled readily andthe entire scale being set up with a minimum of effort and time, toproduce a weighing apparatus which will have along life with freedomfrom mechanical or other difiiculties.

A further object of the invention is that of furnishing a scale,particularly of the fan type, in which friction. will be virtuallyeliminated and in which the amount of weight will be accurately andquickly indicated, the present invention also contemplating theprovision of a scale of this type which may have an increased capacityfactor.

A further object is that of constructing a scale in which the parts areso designed that if adjustment becomes necessary, such adjustment may bemade readily, this pro-vision being also particularly desirable inconnection with the original proper assembling of the scale parts.

Nith these and further obj ects in mind, reference is had to theattached sheets of draw ings illustrating practical embodiments of theinvention, and in which Fig. 1 is 'a plan view of one form of scale withwhich this'invention may be associated.

Fig. 2 is a perspective view of an embodiment of the invention anddiscloses the registering and associated mechanism.

Fig. 3 is av perspective view of part of the mechanism disclosed in Fig.2.

Fig. 4 is a partly sectional view of a connecting arm for associationwith the stale mechanism.

Fig. 5 is a partly sectional view of a modified form of scale mechanism.

Fig. 6 is a partly sectional view of a still further form of scalemechanism.

Fig. 7 is an enlarged perspective view of a detail of the mechanismshown in Fig. 6.

Fig. 8 isan enlarged perspective view of still another detail of saidscale mechanism.

1929. Serial No. 348,755.

Fig. 9 is plan view of another type of scale with which the inventionherein described may be used.

Fig. 10 is a perspective view of a detail of a scale shown in Fig. 9.

Fig. 11 is an enlarged perspective view of a bearing member.

Fig. 12 is av partly sectional view of the member in association with acounter-weight and Fig. 13 is a partly sectional view of still anotherform of scale mechanism.

Referring primarily to Figs. 1 to 4, it will be noted that the numeral15 indicates the scale base, from which there extends a yoke 16 havingsuitable bearings (not shown) to support the beam 17. This beam mounts,adjacent its outer end, a pan support 18 and is connected at its innerend with a dash pot 19, it being finally observed that for a purposehereinafter brought out, the inner end of the beam may terminate in areceiving portion 20. This beam and its associated parts are so balancedthat they will assume horizontal posi tions, and oscillations of thebeam will be dampened by the dash pot.

Now with a view to providing means which will register deflections ofthe beam from horizontal positions, a casing is mounted adjacent theinner end of the base 15. This casing has an opening within which achart is visible and the graduations of this chart are traversed by apointer 21. With the exception of the latter, none of the foregoing hasbeen shown, in that the shape of the casing, its exact position withrelation to the beam, the specific indicia of the chart, etc., are wellknown to any one skilled in the art of scales and these elements,exceptin so far as they are necessary to provide a complete scale, form nopart of the present invention.

Sufiice it to say that a bracket portion may either form a part of thedial casing or this element, which has been indicated at 22, may be inthe nature of a separate unit firmly attached thereto. An extension 23forms a part of the bracket and the inner end of a fieXion strip 24 isadjustably clamped to this extension. The inner end of the strip mayKim! be similarly secured to a block 25 and an arm 26 extends from thisblock and has the lower end of the pointer 21 secured to it. A curvedcontact element 7 is associated with the block 25 and this connection ispreferably provided by the use of an under cut slot formed in the blockand within which a clove-tailed extension 28 of the contact elementrides, relative movement between the parts being provided by anadjusting and locking screw 29. At its lower end the contact elementfixedly car ries a connecting member 30, the upper end of which issecured to a bar 81 mounted upon the screw threads 32 forming a part ofa rod 33. This rod may terminate in a screw-threaded and pointed bearingportion 3%, with which a retaining member 35 is associated. Extendingfrom the beam is an arm 36 having at its outer end a bearing recess 37and the end portion as rests within this recess, as shown in Fig. 4, anddisplacement of these parts is prevented, obviously, by the retainingmember 35.

It will be obvious, in a scale of this character, that with the partsproperly set up the beam will extend in a horizontal condition and theflexio-n strip, together with its associated parts, will assume thecondition illustrated in Fig. 2. If, now, a load is placed upon the panassociated with the support 18, the inner end of the beam will moveupwardly and against the increasing resistance offered to such movementby the flexion strip. This will occur incident to the fact that theconnecting member 30 will transmit the movements of the bar 31 to theelement 27. While referring to this point it is well to note that thecontact element 27 has a curvature corresponding, preferably, to a camface. In other words, its bearing surface is not at all pointsequi-distant from the inner end of the flexion strip. This is extremelydesirable according to the present invention in that, by such aconstruction, the pointer 21 will have movements of equal range for allgiven equal increases in load-thrust upon the pan support. In otherwords, it is apparent that the outer end of the flexion strip might bedeflected a given number of degrees upon one ounce thrust being exertedupon it, but such deflection would not be five times as great if a fiveounce thrust were utilized, in that the flexion strip offers aprogressively increasing resistance to deflection. Thus,while it is notabsolutely necessary,if, in accordance with the present invention thisfeature is employed, a registering range will be presented, thesub-divisions of which are equi-distant throughout such entire range. Inthis connection it will be observed, moreover, that preferably,according to the present invention, the load supporting arm of the beamis far shorter than that of the thrust imparting arm thereof. As aconsequence, it will not be necessary to employ a strip which will offera large measure of resistance to deflection, with consequent danger ofinaccuracy in the case of weighing comparatively light objects.

The value of the receiving portion 20 will now be apparent in that,necessarily, in any scale of this type, danger of inaccuracy exists iftoo great a range of movement and weighing is permitted. On the otherhand, it sometimes becomes necessary to weigh an object exerting athrust greater than the capacity of the scale. If, now, such a load isimposed upon the pan support 18 the inner end of the beam will be thrownupwardly to the full limit of its movement. However, by virtue of thereceiving portion 20, it is practicable to dispose a counterweight inassociation with the inner end of the beam and the weight value of whichis known, so that objects nominally beyond the range of the scale mayhave their weight registered with accuracy. Finally, it will beappreciated that the receiving port-ion preferably extends beyond thecasing, so as to be readily accessible to the operator.

Now referring to the structures shown in Figs. 5 to 12 inclusive, itwill be noted that a scale has been shown which includes a base 38, fromwhich a standard 39 extends upwardly. This standard or yoke rockinglysupports a beam 40 mounting a pan support 41, and the inner end of thebeam preferably has a dash pot 42 associated with it. The beam isnormally balanced or maintained in neutral position by, for example,counterbalancing its structure with a weight 43 which is disposedadjacent its outer end and this weight. as shown in Fig. 10, may have arecessed body for the reception of a subsidiary weight laiadjustablelongitudinally of the beam axis so that accurate compensations may bemade.

As in the preceding form of scale, a casing for a dial is providedadjacent the inner end of the beam and the indicia of the chart withinthis casing is traversed by a pointer 4-5. This pointer, as shown inFig. 5, may be mounted upon an extension 46 which is secured to atransmitting element 47', the outer face of which is curved, preferablyas in the manner afore-described in connection with the element 27.These members are secured to the outer end of a flexion strip 48 and theinner end thereof is adj ustably mounted as at .9, to a bracket 50 whichis either an integral portion of the casing or, preferably, as shown, isa separate unit. From the element 47 a connecting member 51 extends, theupper end of which is se' cured to this element, its body lying incontact with the curved face thereof. The lower end of the connectingmember is secured by, for example, a loop and hook structure indicatedat 52 and 58 to a coupling element 54 having a bearing recess withinwhich the bearii'i'g member 55 of an arm 56 extends, thisarmbeingsecu-red to the beam 40.

Obviously, as loads are imposed upon the pan support 41, the inner endof the beam will be depressed, which will flex the strip 48' and theweight value of the imposed load will be accurately indicated by theregistering mechanism including the pointer 45, it being here noted thatif a factor of increased i capacity isde'sired,the outer end of the beammay be provided with an extension 57 which mounts a knife edge support58 for the reception of a counter-weight 60. It will be observed thatdue to the manner in which the support 58 is c0nstructedi. e. arecessing of the face thereofthat the loop of the weight will notreadily become accidentally detached from this support, and thus nodifficulties will be experienced in this connection.-

In most instances it is desirable, in lieu of the structure justdescribed, to employ the structure illustrated in Fig. 6, in which thepointer is secured, at its outer end, to the bracket 61, which rockinglycarries a contact element 62 by means of pivots 63. For the purposes ofadjustment, the lower portion of the contact element may be extended substantially parallel to the under side of the bracket and carry, at thispoint, an adjusting screw 64 which bears against the under side of suchbracket. It is here to be noted that the face of the contact element ispreferably curved, as has been previously described, and it is obviousthat, by varying the position of the screw 64 or other ele ment employedfor this purpose, the scale mechanism may be adjusted with that degreeof nieety which will assure perfect operating results. Secured to theupper end of the element 62 is a connecting member 65. This member, aswell as the members shown in previously described views, are preferablyin the nature of metal tapes. Obviously, however, any desired equivalentstructure might be employed. Secured to the lower end of the member 65is a loop element 66 carrying a bearing screw 67, the reduced upper endportion of which seats within a bearing recess 68 forming a part of thearm 56.

In this view, and in Figure 8, the preferred method of adjusting theflexion strip is shown, which embraces the thought of employing arecessed support 69which may form a part of the bracket or an integralportion of the casing. The inner end of the fleXion strip 70 is clampedas, for example, by a screw 71 and this screw passes through the opening72 of a supporting member 73 having a contact portion 7 4. It is obviousthat after the scaleis set up and such other adjustments as arenecessary have been made, that the t'ester,by simply shifting thesupporting member inwardly or outwardly with respect to the strip,varies the effective fiexion justment has been found to be of greatvalue in connection with scales, generally, and flexion strips 111partlcular.

Finally, referring to Flgure 13, it will be observed that a structurehas been shown which, in certain aspects, is not as desirable as thatillustrated in Fig. 6, but which structure may be advantageouslyemployed in certain instances. In this view the numeral 7 5 indicates afleXion strip, the outer end of which is secured to a bracket 76carrying a pointer 77. This bracket is pivotally or otherwise attachedto a rod 78 having suitable connection with the beam and an adjustingmember 79 in the nature of a screw may be employed in order tocompensate for various factors before and during the use of the scale.

From the foregoing it will be appreciated that, among others, theseveral objects spe cifically aforementioned are achieved. it isintended, however, that numerous changes in construction andrearrangement of parts might be resorted to without departing from thespirit of the invention as defined in the claims.

Having described my invention, what I claim as new and desire to secureby Letters Patent is: N

1. A scale including a rockingly mounted beam, a resilient elementdisposed in a substantially ho iaontal plane and adapted to be flexedtransversely of its body, a registering mechanism including anindicating member connected to said element and extending substantiallyat right angles to the body thereof and means connecting said element tosaid beam.

2. A scale including a. rockingly mounted beam, a resilient element tobe flexed transversely of its body, means for fixedly supporting one endof said element, a registering mechanism including an indicating membersecured to the opposite end of said element and extending substantiallyat right angles thereto and means having one of ends connected to saidelement adjacent the point of connection of the member therewith and theopposite end thereof being connected to said beam.

3. A scale including a rockingly mounted beam, at flexion strip, meansfor retaining one end of said strip against movement, a registeringmechanism including an indicating member secured to the opposite end ofsaid strip and extending substantially at right angles thereto, andmeans connected to the latter end of said strip and to said beam foroperatively coupling the flexion strip thereto.

4E. A scale including a rockingly mounted beam, a resilient element tobe flexed transconnecting said member to said latter scr p end to havesaid member extend subs a centrally m the body of said element.

6. A scale including a base, a beam, extending from said base for rocn'iounting said beam, a tlexion strip, men is for connecting one end ofsaid strp rctain the same against movement with res to said base, aregisteringmechanism including an indicating member secured to theopposite end of said strip with the said nember extending substantiallcentrally of 1 strip and means for connecting tilt r. end of the stripto the beam.

7. A scale including a frame, a rockingly mounted beam carried by saidframe, flexion strio secured at one end to said frame, a registeringn'iechanism associated with 9 other end thereof, a contact elementcarried by said strip and presenting an arcuate face and a connectingmember secured to said element and bearing against the curved facethereof, said member being secured to said beam.

8. A scale including a rockingly mounted beam, a :llexion strin, meansfor supporting said fleXion strip at one end thereof, a connectingmember extending upwardly from Jaid beam, a contact element presenting acurved outer face and carried by the outer end of said strip, aregistering mechanism forming a part of said scale and said connectinmember being secured to the upper end or said contact element whereby,as said beam moves downwardly, to depress the outer end of said fleXionstrip and actuate said registering mechanism.

9. A scale including a flGXlOll strip means for supporting said flexionstrip at one end thereof, a contact element presenting an outer facecorresponding to that of a cam, a registering mechanism connected saidelement, means for securing said element to the outer end of said strip,a roclringly mounted beam and a connecting member extending from saidbeam to the upper end of said element and in contact with the said facethereof.

10. A scale including a flexion strip means for supporting said flexionstrip at one end thereof, a contact element rockingly secured to theouter end of said fiexion strip, means for normally retaining saidelement against rocking movement with respect to said strip, a rockinglymounted beam, a connecting membe extending from said beam to said eleanda registering mechanism connected 11. it scale nc ng a rockingly mountedboa a tie means for supporting said flexion s A one end thereof, meanstor clamping? the carer end of said strip and an adjusting i tassociated with said last nau'ied means and sh ble longitudinally of andstrip to vary the resistance offered by 1. 1.1. die iattei.

cale inchidinga roclringly mounted 'esilient element to be flexed longios body, a base for mounting one id element and supporting said ed membersecured to the oppod element and means connecting adjacent its end tosaid curved elescale including, in combination, a am, means forrockingly supporting or said beam, a flexion element y said base, aregistering mechanism ass ciat d with said element, a curved uberextending ransversely of said beam ecui ed to said element and means idcurved member to the free i l beam.

0 including a base, a beam, means from said base and rockingly mourningone end of said beam, a flexion strip, means for mounting one end ofsaid lesion strip upon said base, a curved element secured to theopposite end of said strip and extending transversely of said beam andfie ale member secured to the free end of aid beam and connected to rideupon the curved face of said element.

A scale including a base, a beam rockingly mounted upon said base, afleXion strip supported by said base and having one of its ends linedagainst movement with respect thereto, a curved element usta'blyconnected to the opposite end of aid strip, a tape con nected tooperatively bear against the curved face of said element and meansconnecting the end of said strip to said beam.

16. A scale including a base, a flexion strip carried by said base, abeam rockingly mounted by said base, a pan support beyond one end ofsaid point of rocking mounting and associated with said beam, a push-rodconnected to the other end of said beam, a strap connected to said rod,a curved contact element secured to said fleXion strip and a flexiblemember connected to ride against the curvel face of said element andsecured to said rod.

In testimony whereof I allix my signature.

GEORGE lVALKER.

